Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 66 · 40 questions

Remember (Find the topic, use the idea): Find the topic: circuit, safety, formula, component, program, sensor or IoT. Use that lesson’s rule — complete loop, V = I × R, P = V × I, last command wins, true → if part. Safety answers are always: low voltage, dry hands, an adult, never the mains.

1. 1.🔍 Which is the odd one out? (a) a room heater (b) a rice cooker (c) a water heater (d) an exhaust fan
2. 2.True or false: to fly kites in open fields is not safe. (a) True (b) False
3. 3.What does a slide switch do? (a) closes near a magnet (b) slides side to side (c) flips up or down (d) closes when tipped over
4. 4.✏️ In a cell symbol, which line is the + terminal? (a) the longer line (b) both lines (c) the shorter line (d) neither line
5. 5.True or false: to open a phone charger is safe. (a) False (b) True
6. 6.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) output (b) input (c) process
7. 7.🗺️ Before building a project, what should you write down first? (a) nothing at all (b) the final price (c) the box colour (d) inputs and outputs
8. 8.📏 How many ohms (Ω) is 0.3 kΩ?
9. 9.🔌 Which metal is used for most electric wires at home? (a) rubber (b) copper (c) plastic (d) glass
10. 10.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a resistor (c) a motor (d) an LED
11. 11.🔢 To plan an electronics project, which comes first: “list inputs and outputs” or “test it and fix it”? (a) list inputs and outputs (b) test it and fix it
12. 12.🔺 A current of 0.2 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
13. 13.🔁 What must there be for a current to flow? (a) a plastic gap (b) a complete loop (c) a broken path (d) one loose end
14. 14.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
15. 15.True or false: two or more cell symbols is the symbol for a battery. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a sound sensor (d) a water pump
17. 17.Which of these is an insulator? (a) a steel spoon (b) a dry cork (c) a safety pin (d) a graphite rod
18. 18.🌐 Is an app-controlled bulb an IoT device? (a) not an IoT device (b) an IoT device
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
20. 20.🔺 A current of 25 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
21. 21.🔺 A current of 20 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
22. 22.Which of these is measured in volts (V)? (a) power (b) the flow of charge (c) current (d) the push of a cell
23. 23.🧮 A 1.6 V battery is joined to 6 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
24. 24.🔺 A current of 1 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
25. 25.🔋 Does a refrigerator give electricity or use electricity? (a) gives electricity (b) uses electricity
26. 26.Which of these is not an IoT device? (a) a smart energy meter (b) a Wi-Fi smart plug (c) a Wi-Fi weather station (d) a plain table fan
27. 27.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
28. 28.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = R ÷ I (c) V = I × R (d) V = I ÷ R
29. 29.⚠️ Is it safe to stay away from pylons? (a) safe (b) not safe
30. 30.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) series (b) parallel
31. 31.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) smaller (c) zero (d) bigger
32. 32.True or false: a laptop needs much more power. (a) True (b) False
33. 33.🔁 x = 2
    repeat 2 times { x = x × 2 }
    What is x at the end?
34. 34.Which of these is measured in amperes (A)? (a) current (b) energy used each second (c) voltage (d) resistance
35. 35.🔁 repeat 6 times { repeat 6 times { beep } }
    How many beeps are there?
36. 36.Which of these has no microcontroller inside? (a) a TV remote (b) a candle (c) a digital thermometer (d) a smart watch
37. 37.🧩 Which component stores a little charge? (a) LED (b) capacitor (c) LDR (d) potentiometer
38. 38.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
39. 39.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
40. 40.🔋 3 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =

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